Is it legal for employees to open an account to speculate in US stocks, and the company earns commission?

It is impossible to judge whether this company is legal or not. It is worth noting that many companies now recruit some people in the name of recruiting traders, and then let them use their own money to open accounts in the company for stock trading. The company charges, euphemistically called training. Those who pass the training can officially become traders. If they fail, they will be fired within the specified time. I think more than 90% of them should have been fired, and these employees should have paid a high handling fee for their transactions. I don't think such a company should be so formal.